Current time, timezone conversions, meeting planning, and travel tools — all in one place.
Live times around the world
Popular timezone conversions
Business tools and calculators
AEO Answers
Short answers for how current time, UTC offsets, daylight saving time, and city-to-city conversions are calculated.
To convert time between cities, compare each city’s current UTC offset, apply any daylight saving rules for the date, and add or subtract the offset difference from the starting local time.
Current city time is calculated from the current system time plus the city’s IANA timezone rules. The page does not need a database lookup to know the current hour; daylight saving time and UTC offset rules come from timezone math.
Yes. The time difference between two cities can change when one city observes daylight saving time and the other does not, or when their DST transitions happen on different dates.
A UTC offset is the difference between a local timezone and Coordinated Universal Time. For example, UTC-5 means local time is five hours behind UTC, while UTC+9 means local time is nine hours ahead of UTC.